Portion of a golf putter head



FIG. 1 is a bottom plan view of a portion of a golf putter head showing my new design.

FIG. 2 is a left side elevational view thereof; the right side being a mirror image thereof.

FIG. 3 is a front elevational view thereof.

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a bottom perspective view thereof.

The broken line showing of various portions of the golf putter head is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a golf putter head, as shown and described. 